Wigan extended their best start to a Premier League season to three unbeaten games as Franco Di Santo's brace gave them victory over QPR.
The Argentine volleyed home in the first half and found the top corner with a deflected drive in the second to give the Latics a deserved win.
They didn't have it all their own way, though, as QPR's Adel Taarabt twice struck the same post in the first half.
Bruno Perone also hit the woodwork from a second-half Taarabt corner.
Wigan's victory brings a successful end to their early-season trilogy of games against the newly promoted sides, following draws with Norwich and Swansea.
Martinez delighted with 'great win'
For the large part this was an intriguing contest between two closely matched sides.
The difference between the two, and what may ultimately prove decisive over the course of the season, is that Wigan have a broader and more incisive threat in attack in the form of Victor Moses, Hugo Rodallega and goalscorer Di Santo, who was busy throughout and brilliant when it mattered.
His first goal, four minutes before the break, was a masterclass in technique as he flicked up a pass from Moses and hammered a volley, which grazed Shaun Derry's hand en route, past Paddy Kenny from 25 yards.
For his second he initially frustrated strike-partner Rodallega by taking the ball off his foot on the edge of the area, but then wipe away the Colombian's chagrin by planting a drive in the top corner courtesy of a decisive deflection off Perone's back.
Moses was equally busy and almost scored himself early in the first half courtesy of a mini-demonstration of his own skill, as he jinked past two defenders before flashing his shot across goal.
Guy MowbrayMatch of the Day commentator
"I particularly enjoyed Wigan's football. Fourteen passes in the build-up to the first goal. Di Santo, Rodallega & Moses a front-three handful."
In contrast to their hosts, QPR rely primarily on the threat of the mercurial Taarabt.
The Moroccan led the Hoops' fight at the DW, twice hitting the post in the first half - firstly from a superb 20-yard curling shot and then via a deflected free-kick from 35 yards, which Ali Al Habsi palmed onto the woodwork - but they cannot rely on him alone.
New signing Joey Barton was consigned to the stands after he signed too late to feature, but it is clear to see how his drive will improve Rangers' midfield.
In a tame second-half performance, the visitors managed only a handful of meaningful efforts, the best of which Perone headed against the bar from a corner.
Wigan manager Roberto Martinez:
"It's important to get that first win. We knew we needed a good start and it's been pleasing to see how we're working and the competitive edge we have.
QPR boss Warnock desperate to bolster squad
"In football you should never be happy with what you've got and there are things we need to work on. But it's pleasing that our three performances have shown us getting stronger.
"It's more than just the goals with Franco. He is going through a maturity process but the way he works for the team is very valuable. The front three are starting to show good association between them."
QPR manager Neil Warnock:
"I think Di Santo should buy a lottery ticket tonight, having both goals going in off deflections.
"We've had a bit of short change but I can't fault the lads, they given me everything today. It just didn't go for us.
"I'm pleased with the effort they put in today. I thought they were fantastic and I told them I couldn't ask for more. If we'd scored first we'd have won the game."
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